This thought was inspired by a comment from the current leading answer, by @Sentrythe current leading answer, by @Sentry, to the question Where are all the slow neutrinos?Where are all the slow neutrinos?
This [slow-neutrino induced nuclear decay] will still be an extremely rare process and the big problem is to distinguish it from normal spontaneous nuclear decay.
Questions which would need to be addressed as corollaries to the main question, I believe, include:
Is such a possibility self-consistent as a theory?
How does the required energy density of slow neutrinos compare to the postulated energy density of dark matter?